<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>小练习</title>
	<style type="text/css">
		.lv{
			color: green;

		}
		.big{
			font-size: 40px;

		}
		.line{
			text-decoration: underline;
		}
		/*
		.lv{
			color: green;
			font-size: 40px;
		}
		.lv2{
			color: green;
			font-size: 14px;
			text-decoration: underline;


		}
		.lv3{
			font-size: 40px;
			text-decoration: underline;

		}*/

	</style>
</head>
<body>
	<!-- 公共类    共有的属性 -->
	<div>
		<p class="lv big">段落1</p>
		<p class="lv line">段落2</p>
		<p class="line big">段落3</p>
	</div>
	
</body>
</html>